increasing the resistance to physicochemical environmental stress in ornamental tiger barb (capoeta tetrazona) by feeding supplementary gammarus powder

this experiment was conducted to increase the resistance of tiger barb (capoeta tetrazona ) against environmental stress by feeding brackish water gammarus sp. powder as supplementary diet in three levels (25%, 50% and 75%) and three replicates pe group compared to control group for 60 days. fishes was fed with 4 diet treatment containea of: 100% artificial diet (control group), 25% brakish water gammarus and 75% artificial diet, 50% brakish water gammarus and 50% artificial diet and 75% brackish water gammarus and 25% artifical diet. at the end of experiment, the group that was fed with 25% brackish water gammarus powder and 75% artificial food in exposed to ph=3/8, temperature=15c and deficiency of oxygen hat a significant higher for survival than other groups. at the results obtained, it can be suggested that using of 25% brackish water gammarus powder with artificial diet sft00 for rainbow trout is suitable for production of highly quality ornamental tiger fish.